ClosureWrappingNotificationFilter.java

/**
 * Helios, OpenSource Monitoring
 * Brought to you by the Helios Development Group
 *
 * Copyright 2007, Helios Development Group and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 
 *
 */
package org.helios.gmx.jmx;

import groovy.lang.Closure;

import javax.management.Notification;
import javax.management.NotificationFilter;

/**
 * <p>Title: ClosureWrappingNotificationFilter</p>
 * <p>Description: </p> 
 * <p>Company: Helios Development Group LLC</p>
 * @author Whitehead (nwhitehead AT heliosdev DOT org)
 * <p><code>org.helios.gmx.jmx.ClosureWrappingNotificationFilter</code></p>
 */

public class ClosureWrappingNotificationFilter implements NotificationFilter {
	/** The wrapped closure */
	protected final Closure<?> closure;
	/** Additional closure arguments */
	protected final Object[] arguments;

	
	
	/**
	 * Creates a new ClosureWrappingNotificationFilter
	 * @param closure The closure that will determine the notification filter
	 * @param arguments The arguments to the closure
	 */
	public ClosureWrappingNotificationFilter(Closure<?> closure, Object...arguments) {		
		this.closure = closure;
		this.arguments = arguments;
	}

	/**
	 * {@inheritDoc}
	 * @see javax.management.NotificationFilter#isNotificationEnabled(javax.management.Notification)
	 */
	@Override
	public boolean isNotificationEnabled(Notification notification) {
		if(closure==null) return true;
		Object[] args = new Object[1 + (arguments==null ? 0 : arguments.length)];
		args[0] = notification;
		if(arguments!=null) {
			System.arraycopy(arguments, 0, args, 1, arguments.length);
		}

		return (Boolean)closure.call(args);
	}

}